From 9190e983315c9421ae4b6829997f161141a733c5 Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@sequoia-pgp.org>
Date: Wed, 6 Oct 2021 14:31:12 +0200
Subject: openpgp: Add MPI::zero and MPI::is_zero.

---
 openpgp/src/crypto/mpi.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'openpgp/src')

diff --git a/openpgp/src/crypto/mpi.rs b/openpgp/src/crypto/mpi.rs
index 9e34f96f..e21ba98a 100644
--- a/openpgp/src/crypto/mpi.rs
+++ b/openpgp/src/crypto/mpi.rs
@@ -117,6 +117,16 @@ impl MPI {
         val
     }
 
+    /// Creates a new MPI representing zero.
+    pub fn zero() -> Self {
+        Self::new(&[])
+    }
+
+    /// Tests whether the MPI represents zero.
+    pub fn is_zero(&self) -> bool {
+        self.value().is_empty()
+    }
+
     /// Returns the length of the MPI in bits.
     ///
     /// Leading zero-bits are not included in the returned size.
-- 
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